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Finding the Fourth Proportional to 66,742.32, 100,113.45 and 19,995.20

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Solution

The fourth proportional to 66,742.32, 100,113.45 and 19,995.20 is: 29,992.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,742.32 : 100,113.45 = 19,995.20 : x
  2. Step 2: Convert to fraction form
    66,742.32/100,113.45 = 19,995.20/x
  3. Step 3: Cross multiply
    66,742.32x = 100,113.45 × 19,995.20
  4. Step 4: Simplify right side
    66,742.32x = 2,001,787,954.87
  5. Step 5: Solve for x
    x = 2,001,787,954.87/66,742.32
  6. Step 6: Final answer
    x = 29,992.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.